text: /*
   *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
   *
   *  Use of this source code is governed by a BSD-style license
   *  that can be found in the LICENSE file in the root of the source
   *  tree. An additional intellectual property rights grant can be found
   *  in the file PATENTS.  All contributing project authors may
   *  be found in the AUTHORS file in the root of the source tree.
   */
  
  /******************************************************************
  
   iLBC Speech Coder ANSI-C Source Code
  
   WebRtcIlbcfix_MyCorr.c
  
  ******************************************************************/
  
  #include BOSS_WEBRTC_U_modules__audio_coding__codecs__ilbc__defines_h //original-code:"modules/audio_coding/codecs/ilbc/defines.h"
  
  /*----------------------------------------------------------------*
   * compute cross correlation between sequences
   *---------------------------------------------------------------*/
  
  void WebRtcIlbcfix_MyCorr(
      int32_t* corr,  /* (o) correlation of seq1 and seq2 */
      const int16_t* seq1,  /* (i) first sequence */
      size_t dim1,  /* (i) dimension first seq1 */
      const int16_t* seq2, /* (i) second sequence */
      size_t dim2   /* (i) dimension seq2 */
                            ){
    uint32_t max1, max2;
    size_t loops;
    int right_shift;
  
    // Calculate a right shift that will let us sum dim2 pairwise products of
    // values from the two sequences without overflowing an int32_t. (The +1 in
    // max1 and max2 are because WebRtcSpl_MaxAbsValueW16 will return 2**15 - 1
    // if the input array contains -2**15.)
    max1 = WebRtcSpl_MaxAbsValueW16(seq1, dim1) + 1;
    max2 = WebRtcSpl_MaxAbsValueW16(seq2, dim2) + 1;
    right_shift =
        (64 - 31) - WebRtcSpl_CountLeadingZeros64((max1 * max2) * (uint64_t)dim2);
    if (right_shift < 0) {
      right_shift = 0;
    }
  
    loops=dim1-dim2+1;
  
    /* Calculate the cross correlations */
    WebRtcSpl_CrossCorrelation(corr, seq2, seq1, dim2, loops, right_shift, 1);
  
    return;
  }
  